fluorescence under UV lightfront: square with inscription, "50 ZL", in top left-hand corner, metallised ink in bottom right-hand corner in separate window, and fragment of guilloche background on right-hand side of note (all in willow green); serial number printed vertically in orange on right of noteback: fragments of graphic design on upper left- and right-hand sides of note and initials "NBP" in bottom right-hand corner (all in light willow green)

see-through register (recto-verso)drawing of crown in oval and clear windows to left of portrait, above and symmetrically below, at edges of note within guilloche background

latent image (angle effect)crown in oval or number "50" become visible on front of note, in separate field on lower right-hand side, depending on angle of vision

optically variable inkon front of note, to right of portrait, crowned letter "K" changes colour from pink to grey-green depending on angle of vision

Serial number:two upper-case letters and seven digits on front of note, printed horizontally in black on lower left-hand side and vertically in red on right-hand side

Predominant colours: navy blue, blue, light green

Front design:Portrait of King Casimir III the Great in centre area, with inscription, "KAZIMIERZ I WIELKI", in decorative medallion. Left of portrait - at top, inscription, "NARODOWY BANK POLSKI"; below that - depiction of eagle, emblem of Polish Republic; below that - inscription, "WARSZAWA 25 MARCA 1994 r."; below that - inscription, "PREZES", and signature; below that - inscription, "GLOWNY SKARBNIK", and signature. In background of inscriptions and emblem - stylised Gothic rosette. On left-hand side of note, in area of watermark - composition of guilloche lines. In top left-hand corner, arranged vertically - number "50", with line underneath and inscription below, "PIECDZIESIAT ZLOTYCH". In bottom left-hand corner - marking for the visually impaired, consisting of diamond with raised edges. Right-hand side of note contains two separate fields, upper and lower. Upper field bears number "50", with drawing of crown in oval below and four "50"s around crown, and monogram, crowned letter "K", underneath. Number "50" in top left-hand corner, line below that, marking for the visually impaired and upper right-hand field are all filled with white ornamentation. Background of note consists of guilloche mesh with intersecting lines of blue, light violet and beige.

Back design:Depiction of eagle from royal seal of Casimir III the Great in centre area, with royal insignia, orb and sceptre, underneath. At top - inscription, "NARODOWY BANK POLSKI". Below seal - rectangular field of ornamentation bearing number "50" to left and inscription, "PIECDZIESIAT ZLOTYCH", to right. To left of eagle, on decorative guilloche ribbon - drawing of crown in oval and four "50"s around crown, with fragment below of panorama of town of Kazimierz. On right-hand side - fragment of panorama of Cracow, constituting background for legend, "BANKNOTY EMITOWANE PRZEZ NARODOWY BANK POLSKI SA PRAWNYM SRODKIEM PLATNICZYM W POLSCE". Below legend - composition of guilloche lines making up repeated number "50". In top right-hand corner - number "50" filled with white ornamentation, and in bottom corner - initials "NBP". In area of watermark - composition of guilloche lines.

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